Look on Lazada/Shopee for prices, but watch out, there are some fakes about. Ensure it is a Laz Maz site or similar.
Amazon Fire 4K MAX is the best, NOT just 4K.
An Android phone can 'cast' to a Chromecast or a Smart TV, so whatever you can pick up on your phone, it goes onto your PC/telly.
You CANNOT access programs like Netflix, Sky, etc etc unless you have a subscription to them, or an IPTV app, many of which are available for very differing prices.